linux-kernel - [3.4-rc1] attempt to access beyond end of device and livelock

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Message-ID: <CAMVG2st4VPbujSY1hH+VjbR1gxCR0ZEGznrObYMWnpgo++Ynug@mail.gmail.com>
Date:	Fri, 6 Apr 2012 19:36:59 +0800
From:	Daniel J Blueman <daniel@...ra.org>
To:	Josef Bacik <josef@...hat.com>,
	Chris Mason <chris.mason@...cle.com>
Cc:	Linux BTRFS <linux-btrfs@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: [3.4-rc1] attempt to access beyond end of device and livelock

Hi Josef, Chris,

When testing BTRFS with RAID 0 metadata on linux-3.4-rc1, we see
discard ranges exceeding the end of the block device [1], potentially
causing dataloss; when this occurs, filesystem writeback becomes
catatonic due to continual resubmission.

Simply mounting with discard a raid0 metadata filesystem and copying
some data in [2] provokes the issue.

Thanks,
 Daniel

--- [1]

attempt to access beyond end of device
ram0: rw=129, want=8452072, limit=4096000
...

--- [2]

modprobe brd rd_size=2048000 (or boot with ramdisk_size=2048000)
mkfs.btrfs -m raid0 /dev/ram0 /dev/ram1
mount /dev/ram0 /mnt -o discard
cd /mnt && tar -xvzf linux.tar.gz
<access beyond end of device and livelock>
-- 
Daniel J Blueman
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